ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Wenxu Yin,Xue Bai,Ping Chen,Xiaoyu Zhang,Liang Su,Changyin Ji,Haoming Gao,Hongwei Song,William W. Yu
Transition-metal dichalcogenides like tungsten disulfide (WS2) are luminescent but still bear low quantum yields and hardly meet the requirement of practical applications. Here, we developed a hot-injection method to prepare highly luminescent WS2 quantum dots with tunable particle size in a noncoordinating solvent, some that are even smaller than its Bohr radius. The as-synthesized WS2 quantum dots exhibit a narrow size distribution and a high photoluminescence quantum yield of 32%, the highest record compared to the known reports. The WS2 quantum dot layer was employed to fabricate white light-emitting diodes with a maximum brightness of 507 cd/m2, adjustable color temperatures from 4100 to 10 000 K, and excellent color rendering index of 91. These results confirm the promising optoelectronic applications of WS2 quantum dots.
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LAB ON A CHIP
·
2019
·Vol. 19
·期 16
·2651-2662
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IF 6.914
Haili Zhao,Jin Sha,Xiaofeng Wang,Yongchao Jiang,Tao Chen,Tong Wu,Xin Chen,Huajian Ji,Yang Gao,Linsheng Xie,Yulu Ma
Spatially arranged polymer brushes provide the essential capability of precisely regulating the surface physicochemical and functional properties of various substrates. A novel and flexible polymer brush patterning methodology, which is based on employing a digital mirror device (DMD)-based light modulation technique to spatiotemporally regulate a surface-initiated photoinduced atom transfer radical polymerization (photo-ATRP) process, is presented. Various characterization techniques confirm that the spatially and/or temporally controlled brush formation results in complex PEG-derived brush patterns in accordance with a customized digital image design. A series of step-and-exposure strategies, including in situ multiple exposure, dynamic multiple exposure and dynamic sequential exposure, are developed to implement spatiotemporal regulation of the photo-ATRP process, leading to complex patterned and gradient brushes featuring binary functionalities, pyramid nanostructures and radial directional chemical gradients. Moreover, tunable and radial directional concentration gradients of various biomacromolecules (e.g., streptavidin) are obtained through preparation of height gradients of azido-functionalized brushes and subsequent orthogonal chemical activation aimed at specific protein immobilization. Finally, a unidirectional concentration gradient of fibronectin, surrounded by non-fouling PEG brushes, is fabricated and applied for human umbilical vein endothelial cell (HUVEC) adhesion experiments, whose preliminary results indicate gradient-dependent cell adhesion behavior in response to the concentration gradient of fibronectin. The presented fabrication technique could be integrated with microfluidic devices for sensors and bio-reactors, paving the way for novel approaches for lab-on-a-chip technologies.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Yaoqiang Wang,Ziheng Cui,Gang Xiao,Yilin Zhao,Yu Jin,Zishuai Wang,Haijia Su,Tianwei Tan
To study the applicability and mechanism of the visible-light-driven photo-reduction of Cr(VI) is important since it will elucidate the chromium cycle in natural circumstances, and since this reduction reaction is important in treating wastewater contaminated by Cr(VI). Herein, we conducted an in-depth mechanism study for this process using formic acid as electron donor. The positive dependence of the Cr(VI) conversion on the incident light intensity and the good match between the apparent quantum yield (0.0039–0.39%) and the light absorption spectrum (550–365 nm) suggests a light-induced mechanism. The light-induced charge transfer occurs through the ligand-to-metal charge transfer state of the complex which forms between one dichromate molecule and two formic acid molecules through symmetrical or asymmetrical configuration as demonstrated by DFT simulation. EPR analysis further proves that this reaction occurs through a stepwise process with Cr(V) and Cr(IV) as the intermediates. The practical use of this photochemical procedure with broad electron donor scope and wide pH, reaction temperature, and initial Cr(VI) concentration ranges, is proven by the application potential evaluation. The efficient reduction of Cr(VI) by formic acid under sunlight further proves the applicability of this photochemical procedure for the treatment of Cr(VI) contaminated wastewater. Development of the present study into both the treatment of Cr(VI) contaminated wastewater, and other visible-light-driven photo-redox reactions between metals and organics are the subject of further research and results can be expected in the near future.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Zhaolin An,Jianping Gao,Luyao Wang,Xiaoxiang Zhao,Hongduo Yao,Man Zhang,Qiang Tian,Yu Liu
Cadmium sulfide , with its narrow band gap, can be used as a photocatalyst in the visible light region for the splitting of water, but its limited number of active sites and tendency to agglomerate are problematic for producing high yields of hydrogen. Therefore, an inverse emulsion polymerization method was used to fabricate polyacrylamide (PAM) microgels as a substrate to immobilize CdS nanoparticles (PAM-CdS). The PAM microgels not only immobilized the CdS nanoparticles, but also prevented aggregation. N Cd bonds in the PAM-CdS microgels facilitated electron transfer from the PAM to the CdS resulting in more electrons participating in the H 2 production process. The electrostatic interactions between the PAM and CdS also hindered the recombination of electron-hole pairs. These PAM-CdS microgels exhibit admirable photocatalytic H 2 production performance with a H 2 production rate of up to 5.21 mmol h −1 g −1 .
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BIOSENSORS & BIOELECTRONICS
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2019
·
IF 9.518
Mengjun Sun,Yuhan Zhu,Kai Yan,Jingdong Zhang
CdS–In 2 S 3 heterojunction with enhanced photoelectrochemical (PEC) performance was synthesized to construct dual-mode visible light-induced biosensors for highly sensitive and selective detection of bleomycin (BLM). Due to improved absorption in the visible region and suppressed recombination of electron-hole pairs in the heterojunction, CdS–In 2 S 3 composite exhibited enhanced photocurrent response under visible light illumination. Using CdS–In 2 S 3 as photoactive materials and BLM-binding aptamer as recognition element, a PEC aptasensor displaying a declined photocurrent response to BLM was facilely constructed, which was linear to BLM concentration in the range of 5.0–250 nM. On the other hand, the CdS–In 2 S 3 photoanode was employed to construct a photofuel cell (PFC). In such a PFC, the oxidation of water on CdS–In 2 S 3 photoanode under visible light illumination and the reduction of oxygen on Pt cathode led to the generation of electricity. When BLM-binding aptamer was immobilized on CdS–In 2 S 3 photoanode, the output power of the PFC was inversely proportional to the logarithm of BLM concentration from 10 to 250 nM, offering a visible light-induced self-powered sensing platform for BLM detection. Both of the proposed sensors showed high selectivity , good reproducibility and high stability. They were successfully applied to the determination of BLM in human serum samples.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·509-520
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IF 2.064
Tang Chang-cun,Fang Yan-fen,Cao Xin-qiang,Tian Hai-lin,Huang Ying-ping
In this paper, bismuth oxybromide (BiOBr) photocatalysts were synthesized in the presence of tetrabutylammonium bromide (TBAB) at the different volume fractions of ethanol/water and named as BiOBr 0 , BiOBr 20 , BiOBr 50 , BiOBr 80 and BiOBr 100 , respectively. The samples were characterized and applied to the degradation of Rhodamine B (RhB) under visible-light irradiation ( λ ≥ 420 nm). The results indicated that both TBAB and ethanol significantly affected the crystal phase, morphology and surface charge distribution of BiOBr. The exposed (110) faces of BiOBr with Bi 3+ sites contributed to its photocatalytic activity via the enhanced separation of electrons and photogenerated holes as well as the better photo-stability. BiOBr 50 showed the optimal activity for the photodegradation of RhB. Superoxide radical (O ·− 2 ) as the dominant active species was responsible for the degradation of RhB.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2019
·
IF 2.291
Jian Zhang,Lingnan Qu,Yuhang Wu,Yuxuan Ma,Zhanli Chai,Xiaojing Wang
We have prepared a superfine powder Bi 3 TaO 7 which was attached in worm-like Bi 2 O 3 to form a Bi 2 O 3 -Bi 3 TaO 7 composite by a simple facile calcination method. The as-obtained samples were measured by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X-ray spectrum (EDX), Fourier transform infrared spectroscopy (FT-IR), UV–visible diffused reflectance spectrum (DRS) and X-ray photoelectron spectra (XPS). The optimal Bi 2 O 3 -Bi 3 TaO 7 (2.0Bi 2 O 3 :1.0Bi 3 TaO 7 ) sample show the highest photocatalytic efficiency for tetracycline (TC) degradation (90.06%) irradiated with visible light, compared with that of a bare Bi 3 TaO 7 catalyst. Meanwhile, radical capturing experiments indicate that the photo-induced holes (h + ) and hydroxyl radial (•OH) are the main active species. Through the measurement of photocurrent density and electrochemical impedance spectrum, it indicates that the photogenerated carriers are significantly separated due to the formation of heterojunctions . Consequently, the Bi 2 O 3 -Bi 3 TaO 7 photocatalyst may have potential applications in environmental purification.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 33
·10281-10288
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IF 6.641
Mingguang Li,Jun Wang,Ying Zhang,Yizhong Dai,Lingfeng Chen,Chao Zheng,Wenzhen Lv,Runfeng Chen,Wei Huang
Control of interfacial layers is highly effective in tuning charge injection and transport processes in various organic optoelectronic architectures for high device performance. Herein, we developed a thermal imprinting and vapor annealing (TIVA) method to regulate the microstructures of the widely used poly(3,4-ethylenedioxythiophene):polystyrenesulfonic acid (PEDOT:PSS) interfacial layer. The introduced ammonia vapor can reduce the acidity of the PSS units and facilitate the formation of continuous hole-transport channels. Meanwhile, the sub-micron patterns can be efficiently transferred from the flexible template to the PEDOT:PSS layer via thermal imprinting (TI) treatment. Interestingly, the synergistic effects on the PEDOT:PSS hole-injection layer (HIL) result in a current efficiency (CE) of 36.62 cd A−1, power efficiency (PE) of 27.60 lm W−1 and external quantum efficiency (EQE) of 18.80% with a more than 35% efficiency enhancement for the blue phosphorescent organic light emitting diodes (PhOLEDs). This novel TIVA method applied to the regulation of a PEDOT:PSS HIL benefits the performance of PhOLEDs in two ways: (1) to regulate the microstructures of PEDOT:PSS and construct continuous hole-transport channels in the intrinsic PEDOT:PSS layer, and (2) to enlarge the interfacial contact and thus create more hole-transport paths from HIL to hole-transporting layer. These findings will provide a new platform for the rational regulation of HILs with efficient and rich charge-transport channels and thus further advance the realization of high-performance OLEDs.
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RSC Advances
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2019
·Vol. 9
·期 41
·23545-23553
·
IF 3.049
Jianhui Li,Fan Yang,Quan Zhou,Lijie Wu,Wenying Li,Ruipeng Ren,Yongkang Lv
The ternary magnetic Fe3O4/BiOBr/BiOI (x : 3 : 1) photocatalysts were successfully synthesized by a facile solvothermal method. The samples were characterized by XRD, SEM, EDS, ICP-AES, XPS, UV-vis DRS, PL and VSM. Nitrogen-containing dye RhB was used as a degradation substrate to evaluate the photocatalytic degradation activities of the samples. The photocatalytic performance of Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) is superior to other Fe3O4/BiOBr/BiOI (x : 3 : 1). Compared with binary magnetic Fe3O4/BiOBr (0.5 : 1) prepared in our previous work, the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) has obvious advantages in photocatalytic activity and adsorption capacity. And the specific surface area (48.30 m2 g−1) is much larger than that of the previous report (Fe3O4/BiOBr/BiOI (0.5 : 2 : 2)) synthesized by a co-precipitation method. Besides, after 25 s of magnetic field, Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) can be rapidly separated from water. After eight recycling cycles, the magnetic properties, photocatalytic activity, crystallization and morphology of the Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) catalyst remain good. The possible photocatalytic degradation mechanism of RhB under Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) photocatalyst was also proposed. The results indicate that the ternary magnetic Fe3O4/BiOBr/BiOI (0.4 : 3 : 1) composite with high photocatalytic degradation efficiency, good magnetic separation performance and excellent recyclability and stability has potential application prospect in wastewater.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yunhong Pi,Shuo Jin,Xiyi Li,Shi Tu,Zhong Li,Jing Xiao
Constructing advanced heterojunction structures is an effective approach to improve light utility and enhance photogenerated charge separation and transfer for solar energy conversion. Herein, we reported a MWCNT@MOF-derived In 2 S 3 hollow tube heterostructure via facile MOF sulfidation process, significantly boosting its photocatalytic degradation performance of tetracycline (TC) under visible light irradiation. The MWCNT bonds to the In 2 S 3 hollow tube strongly to construct an effective heterojunction, as illustrated in TEM and Raman spectroscopy. The 0.3%-MWCNT@MOF-derived In 2 S 3 exhibited the highest photocatalytic activity for visible-light-driven TC degradation, achieving ˜100% degradation efficiency, with its apparent reaction rate constants 3–5 times higher than that of the pure MOF-derived hollow In 2 S 3 and traditional In 2 S 3 bulk. The boosted visible-light-driven degradation efficiency was attributed to the synergy between electron acceptor of MWCNTs for enhanced separation of charge carriers and active center of MOF-derived In 2 S 3 hollow tube with shorter transfer distance of charge carriers, which not only promotes the carrier transfer and inhibits the recombination rate effectively, but also improves the visible light response. Such MOF-derived visible-light-active heterostructures thus provide a novel insight into the development of highly efficient photocatalyst for a wide usage.
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ChemElectroChem
·
2019
·Vol. 6
·期 12
·3167-3174
·
IF 3.975
Jing Ren,Qiang Luo,Qinzhi Hou,Hui Chen,Tao Liu,Hongcai He,Jinshu Wang,Qian Shao,Mengyao Dong,Shide Wu,Ning Wang,Jing Lin,Zhanhu Guo
Graphical Light it up : Retarding charge recombination and ultraviolet light irradiation degradation of lead-halide perovskite solar cells is highly desirable for their large-scale application. This work demonstrates that a SiO x interfacial layer inserted between the electron transporting layer and light-absorber layer passivates the trap states of lead-halide perovskite and simultaneously suppresses the charge recombination, resulting in an 18 % efficiency output of TiO 2 -based planar perovskite solar cells and improved light soaking stability under ultraviolet light irradiation. Organic-metal lead halide perovskite solar cells (PSCs) featuring low-cost and high efficiency have been recognized as promising photovoltaic devices, but their serious charge recombination and ultraviolet light irradiation instability limit their output efficiency and long-term operation. In this work, we have introduced silicon oxide as an interfacial modifier of the electron transporting layer in TiO 2 -based planar heterojunction PSCs. The incorporation of a silicon oxide modifier passivates the trap states of perovskite absorber and suppresses the charge recombination of PSCs. As a consequence, a competitive solar-to-electricity conversion efficiency of 18.0 % was achieved for the device fabricated with the silicon-oxide-modified TiO 2 electron extraction layer, which is increased by 15 % compared with the PSC fabricated with pristine TiO 2 ; this can be attributed to the significantly increased open-circuit voltage and photocurrent density. Furthermore, the ultraviolet light irradiation stability of PSCs is greatly improved, resulting from the low photocatalytic activity of the silicon-oxide-modified TiO 2 electron transporting layer, as revealed by the photoelectrochemical oxidation of CH 3 NH 2 . This work represents a feasible step through interfacial engineering toward the realization of ultraviolet-light-stable and scalable PSCs.
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ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Misganaw Alemu Zeleke,Dong-Hau Kuo
The oxy-sulfide based V 2 O 5 @(In,Ga) 2 (O,S) 3 nanocomposite catalyst, at different weight percentages of V 2 O 5 , was successfully synthesized via a simplistic procedural route for the detoxification of hazardous Cr(VI). The two pure catalysts were intimately allied and used for visible light-driven reduction of hazardous Cr(VI). The nanocomposite catalysts were characterized to observe the effects of V 2 O 5 on crystal phase, morphology, light absorption , catalytic activity , and electrical properties. Compared to all, 40% V 2 O 5 loaded nanocomposite catalyst, designated as VOS-2, exhibited the best-reducing capability. It completely reduced toxic Cr(VI) at 2 min under visible light illumination. From the kinetics, it was found that the rate constant of the nanocomposite catalyst was improved by a factor of 3.6 compared to the host nanoflower catalyst. The plausible mechanism of charge transfer process across the interfacial region indicates the diminished recombination probability of photogenerated charge carriers. Therefore, the nanocomposite catalyst is promising for enhanced reduction of Cr(VI) in the Cr-based industrial activities, which is significantly relevant for environmental remediation.
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